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If引导的条件状语从句和虚拟语气 - 霂森西 | 櫻玲桉
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If 引导的条件状语从句
条件 IF 从句主句例句特别说明 Zero conditional 现在的真实条件句 (只需要了解）一般现在时一般现在时 If you freeze water, it turns into ice. If I have time, I usually watch TV. 用于普遍真理， 必然发生的事情或习惯动作 1st conditional 第一条件句 将来的真实条件句 (AEIM II U5) 一般现在时 (* 有时也可用现在进行时和现在完成时）一般将来时 (will+ 动词原型)If I have time, I will watch TV tonight. Please call me if you have time. You can call me if you have time.“主将从现”； 有时主句也可用祈使句（主祈从现）或情态动词（如 can, must 等）代替将来时态 2nd conditional 第二条件句 现在和将来的非真实条件句 （AEIM II U14）一般过去时 (did)would + 动词原型 (should/could/ might do)If I had time, I would watch TV now/later on.if 从句 be 动词通常用 “were”; 注意情态动词使用中的区别 3rd conditional 第三条件句 过去的非真实条件句 （AEIM II U16）过去完成时 (had done)would have + 过去分词 (should/could/ might have done)If I had had time, I would have watched TV yesterday. 区别 (would/should/could/might have done)
注意：条件状语从句也可用 when, unless（=if not) 等连词连接，注意区别。
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